Portion of a bag with a napped filamentary exterior surface



FIG. 1 is a perspective view of a portion of a bag with a napped filamentary exterior surface, showing my new design;

FIG. 2 is a top plan view thereof; and,

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image thereof.

The broken lines in all views are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a bag with a napped filamentary exterior surface, as shown and described. 